WK8HW - JO - Homework Assignment (Due on Tuesday): 1)...

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Homework Assignment (Due on Tuesday): 1) Describe the components of our galaxy in detail. Our galaxy is called the Milky Way. The Milky Way Galaxy is over 75,000 ly in diameter and contains over 100 billion stars. The disk of the galaxy is often referred to as the disk component . It contains most of the galaxy’s stars and nearly all of its gas and dust. Because the disk is home to the giant molecular clouds within which stars form, nearly all star formations in our galaxy takes place in the disk. Around the center of the center of our galaxy lies the nuclear bulge; a flattened cloud of billions of stars about 3 kpc in radius. Like the halo, it contains little gas and dust. Astronomers often refer to the halo and the nuclear bulge as the spherical component of the galaxy. The nuclear bulge is the most crowded part of the spherical component. Visible above and below the plane of the galaxy and through gaps in the obscuring dust, the nuclear bulge contains stars that are old and cool like the stars in the halo. The halo contains roughly 200 globular clusters, each of which contains 50,000 to a million stars in a sphere about 25 pc in diameter. Because they contain so many stars in such a small region, the clusters are very stable and have survived for billions of years. 2) Describe the different types of galaxy. List an example for each. Elliptical galaxies – are round or elliptical, contain no visible gas and no dust and have few or no bright stars. They are classified with a numerical index ranging from 1 to 7; E0s are round and E7s are highly elliptical. The index is calculated from the largest and smallest diameter of the galaxy used in the following formula and rounded to the nearest
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This note was uploaded on 01/17/2010 for the course PHY 110 taught by Professor Smith during the Spring '09 term at Upper Iowa.

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WK8HW - JO - Homework Assignment (Due on Tuesday): 1)...

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